LIGHTPLAY™ extends outdoor fetch - any time of day, in any season! The high-visibility fabric with glow in the dark 3D print and Max Glow rubber is fast charging and the glow is long lasting. 5 - 10 minutes under a bright light provides up to 30 minutes of Glow! Designed for the most demanding use by a growing population of fetch enthusiasts, these are not ordinary balls for dogs. Features: • For bigger dogs •Use with Chuckit mega ball launcher • Bright, lasting glow • Charges quickly under any bright light • No batteries needed • Extends Fetch time - early morning or late nights! •Made of high quality synthetic rubber. Dimensions: 3in.